Press for making insulators or similar articles.



M .x Z Z f. a D Z n H U i .w 1 4. T H L, A m M u. M M w i H E l M n u Wm m 7 M A 7 N0- 835,236. PATENTED NOV. 6, 1906. H. M- BROOKPIBLD. PRESSFOR MAKING INSULATORS 0R SIMILAR ARTICLES.

APPLICATION FILED AUG.10,1905.

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H. M. BROOKFIELD.

PRESS FOR MAKING INSULATORS 0R SIMILAR. ARTICLES.

APPLICATION FILED AUG. 10. 1905.

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PATENTED NOV. 6, 1906.

APPLICATION FILED AUG.10.1905.

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PRESS FOR MAKING INSULATORS 0R SIMILAR ARTICLES.

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Hlllll NIH HHIIIIII W/TNESSES: //VVENTO/? V BY 5 ATTORNEYS No. 835,236.PATENTBD NOV.'6, 1906. H. M. BROOKFIELD.

PRBSS FOR MAKING INSULATORS 0R SIMILAR ARTICLES.

APPLICATION FILED we.1o.19os.

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H. M. BROOKFIELD.

PRESS FOR MAKING INSULATORS 0R SIMILAR ARTICLES.

APPLICATION FILED AUG. 10.1905.

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No. 835,236. PATENTED NOV. 6, 1906. H. M. BROOKFIELD.

PRESS FOR MAKING INSULATORS OR SIMILAR ARTICLES.

' APPLICATION FILED AUG.10.1905. 1

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x711 TEESTATES PATENT om n.

HENRY M. 'BRoo1 F EL1 or-NEw YORK: N. Y.

PRESS FOR MAKING INs'uLAToFIs on SIMILAR ARTICLES.

Application filed August 10,;1905. Serial No. 273,568. I

rpiinsulators or similar artic es, and-it has es pecial reference to themoldsdusednnsuch presses and the appurtenances connected therewith. Itis of especial value in connection with automatic presses,al-thoughasonle t5 features of my invention are capable of being" usedwith presses that arenot automatic.

: The objects of my invention are to improve and simplify the molds ofsuch presses, to make them more accurate and certain in'..op.-

2o eration, to improve the insulators or other articles made on them,and to make them i more perfect and serviceable, to provide means forpreventing clogging of the molds,

also to provide means for removing the insu- .25. lators or similararticles from .the molds, and

to convey them to the leer, and to do this without injury to sucharticles, also tonnake the operation of such presses and theirappurtenances more rapid, and generally to g3o. improve the operation ofsuch presses.

-' My invention consists in the novel devices and combinations hereinshown de- :1 I scribed.

,- In the drawings accompanying this speci-' 5 fication and forming parthereof I have shown my improvement as connected with an automatic pressfor making insulators, although its use is not confined to the pressshown and described, as it may be usedwitlrot'herautoo matic presses andin some of its features with presses that are not autoniatic. I

Referrin to the specific form of devices shown in t e drawings, whichrepresent my improvement in its preferred form, Figure 1 45 is a sideelevation of an automatic press embodying' my. improvement in itspreferred form with some of the parts omitted for the purpose ofclearness. -1 i 2 is a horizontal Section on the lines 2 2 of 1g. 1.. 3is a 5o central vertical section through my improved mold, the followerand former andthe screwplunger being shown in moldmg position in I themold. ..Fig. 4 is a s1de elevat1on of the inoldr Fig. .5. is a planview; showingthe .55 r'nold open. Fig. 6 is a plan of the meansforSpecificatign pf Lettersl atent."

' "Patented Nome, 1906.

: removing the insulator from the mold, and

7 is a side elevation of the same. Fig.8 1s a plan of the turning-overcup for placing. the insulators on the endless'chain, and Fig. '9 is aside view of the same. 56

The press shown in the drawings is en--. tirely automatic. 1 is astationary frame supporting the ,other i P g 9f. the Pr ss n m g sta ony: fta e I 6 3is 'a rotary turn-table upon which are @mounted the molds4. As shown in Fig.- 2,- six.'molds are iprovided, although, ofco urse,-:the number 0 -molds may be varied tosuit] "the particularcircumstances.

and former, which are here shown In one piece.-; In the form shown inthe drawings the rotary. fable 3, with its molds and other parts car-*ried by it, are rotated.continuously,although,; 7 5

if desired, this. motion could. be madeintermittent.

The general mode of operating the press shown is as followszz-The glassis inserted at about the point 7. E. (See Fig. 2.) This may 8 o be doneeither by hand or automatically; but as this forms no part of the resentinvention it is not shown. The glass is in-. serted during the rotationof the table. Im--.. mediately after the glass is poured into the 85mold the screw-plunger. and follower are forced into he. lass. Thismovementiis accomplished au omatically by cams, as will be presentlydescribedr. Very soonthere-- after the follower and former are movedup'0 out of contact. with the" molten glass inthe mold, the screwremaining in longer until the insulator isproperly set. This isalso.accom-,x plished by acam. Then the screw,- lunger is screwed out-ofthe {glass in the m0 d-and-is further raised by a weight. The devicesfor accomplishing these two steps will be subse quently described. Thenext operation is to open the two upper movable parts of the mold. Thisoperation is also performed by, 109 cams. The open position of the moldis indi-.;, cated at8. As soon as the mold begins .to open a fork isautomatically moved inward, grasping theinsulatorin one of thecircular.- grooves near the top portion of the insulator, I05 and assoon as the mold is fully opened-the fork is raised, lifting theinsulator upward from the mold, and the fork is thenswung outward andthe insulator diSeEngagedIIrOm 79 r -51s the screw-plunger, andfi'thefollowei it. The insulator falls into 'a cup prepared;

for it, and this cup turns it over, so that the petticoats will bedownward, placing it upon an endless chain running into the leer.

The various devices of the press shown in the drawin s will now bedescribed in the order in which the above operations take place. Mimproved mold is particularly shown in igs. 3, 4, and 5. It consists ofa solid lower art 9, having a hollow cupsha ed interior 10, adapted toform the head of t he insulator, as shown in Fig. 3, and of two movableupper portions 11 11, pivoted together on a pm 12. The meansforwolpening and closing the parts of the mold 1 be presently described.In order to aid in centering the .lower solid part of the mold 9, Ipreferably provide adjusting means, preferably adjustm '-screws 13. Asshown, there are three of t ese. These adjusting-screws pass throu h abase-plate 14, secured to the rotary tab e 3.- I also preferably providemeans for cooling the lower solid part of the mold, as well as the uppermovable parts. The means shown for cooling the lower part consist of aninlet-p'pe 15, connected with any suitable source 0 sup 1 of the coolingmedium,-(not shown,) which delivers the cooling medium to a chamber 16in the lower part of the mold. In order to provide a circulation, thecooling medium is removed from the mold by an outlet-pipe 17, whichdischarges the cooling medium in any suitable wa (Notshown.) Theinlet-pipes 18 simimi; supply a cooling medium for the inte ..r1orchambers 19 of the movable parts of the mold. The outlet-orifices areindicated at 20. In the form shown the parts 21 21 of the base 14 aremade to extend outward sufficiently, so that its upper surface willfurnish a support to the outer ends of the movable upper parts of themold when they are swung open into their opened position, thus relievingthe strain on the pivot-pin 12. The upper outer part of the lower fpartof the mo (1 and. the lower inner part 0 each of the upper movable partsof the mold have doveta' surfaces in the ordinary way in order toinsure-a tight and accurate fit. Heretofore the lower part of the moldat the bottom of this dovetail has always been extended outward in ahorizontal surface, such horizontal surface formin the support for theupper part of the mold when it swings outward. In such a constructionthe powdered glass, dust, and other material are apt to gather on thissupporting horizontal surface and be forced inward into the dovetail asthe movable parts move inward. This prevents the accurate registering ofthese parts and prevents the closing of the mold tightly. Hence themolten glass is apt to leak near the open joint and form seams on theinsulator, often making them wholly unmarketable. In order to overcomethis trouble, I have removed the supporting-surface from proximity tothe dovetail, preferably by separating the mold from the suporting-frame 14 by means of a circular hol ow space 22. Whatever refusematter gathers on the upper part of supporting-surface 21 will fall intothe pocket formed by this space, where it will give no trouble and canbe cleaned out from time to time. By this im roved construction I amenabled always'to c ose the molds tightly.

Pivot-pin 12 is made in the form, referably, of a slightly-invertedtruncate cone, slightly smaller in diameter toward the bottom than atthe top. Heretofore as such pivot-pins have been used they have been aptto work upward, making the joint connection between the two parts of themold a loose one and unfitting the parts for perfect work. In order toovercome this, I preferably employ a locking-bar 23, bolted to support24, projecting upward from base 14. The locking-bar 23 prevents upwardmotion of the pivot-pin 12 and also prevents its turning. Such turningtends to wear the pin and also to lift it. These troubles are overcomeby my improvement. If desired, support 24 can be made adjustablevertically by means of slots 25 and support 24 and screws 26. Asivot-pin 12 wears its vertical position can e adjusted to compensate forit.

The screw-plunger and the'follower and former can be raised and loweredby any suitable means. These form no part of my invention and are notshown in full detail. They are shown merely in general outline and willbe only briefly described in connection with the outline features shown.Both the screw-plunger 5 and the follower and former 6 are moveddownward by frame 27, moving in guides in vertical supports 28. Frame 27is forced downward by a cam-track 29, which is dipped downward in theusual way at the point where the plum er and follower are to be moveddownwar at 30 into the mold. Roller 31, secured to the frame, rides ontop of cam-track 29. 32 32 are two studs fast to the frame, passingthrough holes on the upper part of the follower and former. Springs 33encircle studs 32 and normally tend to press the follower and formerdownward. They are merely for the purpose of permitting the follower andformer to yield in the usual way. When frame 27 moves downward, itforces the follower and former downward through springs 32 and alsoforces screw-plunger 5 downward by means of the frame striking ashoulder (not shown) on the shaft of the screw-plunger 5.

Shortly after the screw lunger and the follower have been pressedownward the follower and former are lifted upward by the raising offrame 27, throu h roller 31 and cam-track 29,to theirnorma positions.The screw is of course ermitted to remain in the glass the proper engthof time to set the screw-thread. It is then raised by means of Masai.

a two-part nut 34, each part of which is mounted on a spring-arm 35.These nuts are normally separated, but are brought together when it isdesired to screw screwplunger 5. As the devices for bringing the nuts toether and separating them are old and welTknown and form no. part of thepresent invention, they are not shown and will not be described. As soonas the nut has closed upon the screw-threaded portion of screw-plunger 5the screw-plunger is rotated by means of a beveled gear 36 on the shaftof screw-plunger 5 and beveled gear 37, which is connected with anysuitable mechanism for' rotating it at the proper time. As suchmechanism is old and well known and forms no part of the presentinvention, it is not shown and will not be described. At all times,except when the screw-plunger is to be raised, this mechanism is notoperated. Af-,

ter the screw-plunger has left the glass it sto s rotating, and 1t ispulled up to its norma position by means of a weight (not shown) securedto ropes 38 38, passing over pulleys 39 39 and secured to cross-bar 40,r0- tatably connected by collars 41 41 to the shaft of screw-plunger 5.

It will of course be understood that suitable means are provided forrotating the table 3. y means may be employed, those shown consisting ofa main driving-shaft 42, driven from any suitable source of power,having a worm 43 meshing with a wormwheel 44, secured to the same sleeve45 that carries the rotary table 3. It will of course be understood thatcam 29 and certain other cams are stationary, the parts operated. bythem coming into contact with them during the rotation of the rotaryturn-table and the arts mounted upon it. 46 is a chain-wheel driven bychain 47 from chain-wheel 48 on shaft 42 and through shaft 49 and gears50 51, the latter driving shaft 52. This drives the mechanism, whichrotates at the proper time the various gears 37, the latter rotating thescrew-plunger 5. The clutch mechanism and the other parts interveningbetween shaft 52 and gear 37 form no part of the present invention andare not shown.

The next 0 eration is the opening of the mold. The d dvices shown forthis urpose are illustrated in Figs. 1 and 2 MIL are as follows:Connected to the outer end of each movable upper half-mold is an arm 53.For pur oses of adjustment this arm 53 is made in t e usual way, withtwo screw-threaded portions and a nut 54. To the other end of arm 53 isconnected an arm 55, fast on upright rod 56, having another arm 57adapted to engage a curved cam-surface 58, secured to frame 27. It willbe understood, of course, that each half-mold is similarly connected toone side of one of the frames 27. The cams 38 are made operative by thelifting of frame 27 at the proper time. This lifting is caused ifrequired to do so.

by roller 31 riding up on the raised portion 59 of cam-track 29. Thisoperation is performed shortly before the point marked 8 in Fig. 2 isreached by a mold The next operation is the raising of the insulator outof the lower solid part of the mold. I prefer to do this by lifting itfrom above. The preferred devices shown for this ur ose consist of aswinging arm 60, provide with a fork 61. This arm swings inward as themold begins to open, so that the fork encircles the msulator in thegroove near the upper part of the insulator. The arm is then raisedvertically, lifting with it the insulator, and it is then swung outwardin its raised position. As it passes outward the lower part of theinsulator or the head strikes the curved surface at the end of astationary arm 62, which forces the insulator out from the fork. Theinsulator then drops into a cup 63. The devices for moving the swingingarm 60 are especially shown in Figs. 1, 2, 6, 7, 8, and 9.

Arm 60 is swung inward by means of a cam-shaped arm 64, fastened to asleeve 65, that carries the swinging arm 60. Sleeve turns on astationary stud 66, fastened to upright standard 28 on the rotary table.A spring 67 normally holds sleeve 65, so that arm 60 is in its outwardposition. As the rotary table rotates cam 64 comes into contact withroller 68, secured to the stationary table 2 of the machine, beingsupported by a bracket 69. There is only one roller 68, and with thisthe different cams 64 come into contact at the proper time. The actionof roller 68 on cam 64 causes sleeve 65 to rotate, swingin arm 60 inwarduntil fork 61 embraces t e insulator.

Sleeve 65 and arm 60 are raised upward by 'means of a sleeve 70, looseon stud 66, u on ed at which sleeve 65 rests. Sleeve 70 is rais theproper time by means of two links 71, pivoted one at each side of thesleeve, the inks being pivotall connected with two links 72, pivoted tot e framework of the rotary table. Links 71 and 72 at their junctioncarry a roller 73. 74 is a cam upon which roller 73 rides when theproper point is reached. There is one cam 74, and it is carried bybracket 69. When a roller 73 strikes it, the roller rides up on it andlifts links 71, sleeve 70,- sleeve 65, and swinging arm 60. This raisesthe insulator high enough so that the arm 60 in swinging outward willcause the insulator to clear the mold. A spring 75, connected withroller 68, permits that roller to give in case arm 60 is blocked andcannot move inward, and spring 76 ermits cam 74 to give in a similar wayshou d roller 73 or its connecting parts be blocked and unable to move.In both of these cases in the instances cited some part of the machinewould be broken unless the roller 68 and cam 74 were permitted to yield,Swinging arm 60 is a there will be no departure moved outward, carryingthe insulator by means of spring 67 whenever cam-arm 64 and roller 68permit the movement. In practice the motion will not be a sudden one, asotherwise the insulator might be thrown out of the fork. Toward theclose of this down somewhat through its own weight,

tending to'make the cross-section of the interior screw-thread departfrom the true circular form. This is a serious objection in practice, asmany insulators will have their screw-threads so distorted that theycannot be screwed upon the wooden screw-pins intended to support them.By turning the insulator over, so that it will stand upon the endlesschain upon the petticoat portion, the insulator will stand with the axisof the interior screw in a vertical fposition,.so that cm the truecircular cross-sectional form. Any settling of the glass will besubstantially at right angles to the line of the screw-thread, and inpractice this leads to no objectionable result. The devices shown forupsetting cup 63 are as follows: They are particularly shown in Figs. 1,2, 8, and 9. In Fig. 2 the cup is shown in its vertical position or theosition in which the insulator is dropped into it, and Fig. 8 shows thecup has turned a quarter-revolution and in the act of spilling out theinsulator upon the endless chain. It is found in practice that aquarter-turn is suflicient for the purpose. Cup 63 also has referably aswin ing horizontal movement 1n order to carry t e msulator from theposition in which it receives the insulator to a osition directly overthe endless chain. Foth of these movements take place together. Theswingin or sidewise movement is caused by means 0 a rod 78, pivoted to arod 79, which supports on 63. Rod 79 is supported toward one en inbearings 80, carried by a stationary bracket-81, projecting from thestationary table 2. It is connected with bearing 80 by means of a swiveljoint. At its inner end it is supported by a toothed segment 82, securedto rod 79 and gearing with a stationary rack 83 on bracket 81. Rod 78asses through a sleeve 84, pivoted or swiveihd to a bell-crank lever 85,pivoted at 86 in the stationary table 2 and carrying at its inner end aroller 87, adapted to engage with cams 88, one for each mold,

The leer is not shown in'the drawin s,

mounted on the rotary table 3. When roller 87 engages cam 88, it forcesrod 79 and cup 63 to swing outward. The motion of the bell-crank to therod 78 is communicated through a spring 89, encircling the rod betweenthe end of the bell-crank and a shoulder 90 on the rod.

Rod 79 and cup 63 are brought back to their normal inward position bymeans of a chain 91, running over a pulley 92, and a chain having at itslower end a weight 93. 79 is slidingly pivoted to bearing 80, passingthrough a sleeve formin part of that bearing. A spring 94, encirc ingrod 79 between the bearing and a shoulder on the rod, holds rod 79 inits normal position, but permits it. to give longitudinally should therebe any blocking. This giving is to revent a breaking of any of the partsshoufd a block occur. is a hand-wheel mounted on rod 79 to permit amanual upsetting of cup 63 should that be desired. The turning movementof cup 63 is imparted to it by toothed segment 82, running over andengaging with rack 83. I find in practice that a quarter-revolution of,the cup is sufficient for the purpose. This throws the insulator out ofthe cup upon the chain, bringing it, with the petticoats, downward, sothat the insulator will stand upon the chain with its head upward andits petticoats down. The endless chain bears it to and through the leer.

It is not essential that the means for raising the insulator or otherarticle from the mold operate from above and lift the insulator. Byasuitable modification the device would operate from below through anopening in the mold to force the insulator up, provision of course beingmade to close the mold tightly for the next operation; nor is itessential that the raising means swing in and out, although I )refer toso arrange them; nor isit essential t lat the means for forcing theinsulator out from the fork be stationary or that one be provided foreach mold, as in the form shown in the drawings, as a single arm couldbe provided for the entire press mounted upon the stationary support ata suitable oint; nor is it essential that the upsetting evice be in theform of a cup, as any suitable device for that )urpose may be em ployedand any suitable means may be provided for the upsetting operation; noris it essential that my improved device for protecting the dovetailjoint between the lower and upper parts of the mold be provided with anopening, as shown in the drawings. It is sufiicient if thesupporting-surface for the upper parts of the mold upon which thepowdered glass and other refuse is liable to fall be not adjacent to thedovetail jointas, for

examp e, the supporting-surface might be jai swinging outward'toits-ontmst limit would always be upon such support.

' In' general my invention is not limited to the specific form ofapparatus shown in the drawin s but those may be changed or variedw1dely without departing from my broad invention.

What I claim as new, and desire to secure by Letters Patent, is- 1. In apress, the combination of a mold I for forming glass insulators or othersimilar glass articles having a single solid ortion adapted to form thehead 0 the insu ator or other article, and a device for lifting the in-5 sulator'or other article from the solid lower part of the mold, andswinging it to one side of the press to remove it from the ress, andmeans for removing it from said ifting device into an upsetting vessel,and means for turning said vessel to u set the article upon areceiving-surface so t at the petticoat or wider ortion of the insulatoror other article wil be downward.

2. In a press, the combination of a mold 2 5 for forming glassinsulators or other similar glass articles having a single solid ortionadapted to form the head of the insu ator or other article, and a devicefor lifting the insulator or other article from the solid lower 0 partof the mold, and swinging it to one side of the press to remove it fromthe ress, and means for removing it from said ifting-device into anupsetting vessel, and means for turning said vessel to upset the articleupon 3 5 a (fonveyer adapted to receive and carry it to a eer.

3. In an automatic ress, the combination 1 of a mold for forming g assinsulators or other similar glass articles having a single solid portionada ted to form the head of the insulator or ot er article, and a devicefor liftin the insulator or other article from the soli lower art of themold, and swinging it to one si e of the press to remove it from thepress, and means for removing it from said iftingdevice into anupsetting vessel, and means for turning said vessel to upset the articleupon a conveyer adapted to receive and carry it to a leer, whereby theinsulators or other glass articles will be automatically removedfrom thelower solid part of the mold, anc delivered to and placed upon aconveyer with the petticoat or wider portion downward ready for passagethrough the leer in that position.

4. The combination of a mold for forming glass insulators or othersimilar glass articles, a lifting-arm adapted automatically to swinginward and grasp the insulator or other arti- 6o cle as the mold opens,and lift it out of the mold and wing it outward free of the press, and adevice for forcing the article from the grasp of the lifting-arm into areceiving vessel adapted to place it upon a conveyer adapt- 6 5 ed tocarry it to the leer.

5. The combination ofa mold for forming glass insulators orlothersimilarglass articles,

alifting-arm adapted automatically to swing inward and grasp theinsulator or other arti-- cle as the mold opens, and lift it out of the7o mold and swing it outward free of the press, and a device for forcingthe article from the grasp of the lifting-arm into an upsetting vesselada ted to receive it, and to upset it with its petticoat or widerportion downward upon 7 5 a conveyer, adapted to carry it to the leer.

6. In a ress for forming glass insulators or other simi ar glassarticles, an u setting vessel for receivin the molded insu ator or otherarticle adapte to upset the said article upon 1: a receiving-surface, sothat its petticoat or wider ortion will be downward.

7. n a press for forming glass insulators or other similar glassarticles, an u setting vessel for receivin the molded insu ator or otherarticle adapte to turn the said article upon a receiving-surface, sothat its petticoat or wider ortion will be downward.

8. nxalgress for forming glass insulators or other si ar glass articles,an n setting ves- 9osel for receivin the molded ins ator or otherarticle adapte to upset the said article upon a conveyer adapted tocarry it to the leer, so that its petticoat or wider portion will bedownward. 5

9. In a ress for forming glass insulators or other si ar glass articles,an u setting vessel for receivin the molded insu ator or other article,means or turning said upsetting vessel to upset the said article upon aconveyer 10o adapte to carry it to the leer, so that its petticoat orwider portion will be downward upon the conveyer, and a conveyer adaptedto carry such article to the leer.

10. In an automatic press for forming 1o 5 glass insulators or othersimilar glass articles, the combination of a turn-table, a plurality ofmolds mounted and carried thereon, means for opening the molds, a liftin-arm adapted automatically to swing inwar and no grasp the insulator orother article as the mol opens, and lift it out of the mold and swing itoutward free of the press, and a series of devices, one for each mold,mounted upon the turn-table, and each adapted to I r 5 force the articlefrom the grasp of the liftingarm.

11. In an automatic press for forming glass insulators or,other similarglass articles, the combination of a turn-table, a plurality of moldsmounted and carried thereon, means for opening the molds, a series oflifting-arms, one for each mold, mounted upon the turn-table, and eachadapted automatically to swing inward and grasp the insulator r2 5 orother article as the mold opens, and lift it out of the mold and swingit outward free of the press.

12. In an automatic press for forming glass insulators or other similarglass articles, I 0

the combina ion of .a turn;table, a plurality upper parts 'ano a lowerpart supporting each ofin'dlds "mounted and carried thereon, upper part,the combination of dovetailing 3 5 means for opening the molds, a seriesof liftparts, one on each upper part of the mold, ing-arms, one for eachmold, mounted upon and corresponding ones on the lower for per- 5 thetum-table, and each adapted automaticmitti tight and accurate closin andregally to swing inward and grasp the insulator istry dgthe movableupper parts the mold,

or other artlcle as the mold opens, and lift it and sup orting-surfaceson the lower part of .40 out of the mold and swing it outward free ofthe mo d for supporting the upper parts, the ress, and'a series ofdevices, one for each placed otherwise than in' the dovetail joint, :0mols, mounted upon the tum-table, each ,whereby clogging of the dovetailjoint will be adapted to force the article from the grasp of prevented.its corresponding lifting-arm. 17. In a mold for forming insulators or 513. The combination of movable parts ofa similar glass articles,composed of movable mold adapted to open or close on each other, {upperparts and a lower part supporting each arloose vertical pivot-pin uponwhich said upper part, the combination of dovetailing movable partspivot, and a locking-pin parts, one on each upper part of the mold,adapted to engage with the pivot-pin to preand corresponding ones onthe'lower for pervent the latter from working upward. mitting tight andaccurate olosin and re 14. The combination of movable parts of a Iistryo the movable upper parts 0? the mole, 2o mold adapted to open or closeon each other, and supporting-surfaces on the lower part of a loosetaperin vertical pivot-pin upon the mol for supporting the upper parts,prowhich said mova 1e parts pivot, and a lock- .vided with a cut-awayportion at each doveing-pin adapted to engage with the pivot-pin 'gtailjoint, whereby any powdered glass or 'toprevent the latter from workingupward. jother refuse material will fall through. the 25 15. Thecombination of movable parts of a opening made by the cut-away portion,and

mold adapted to open or close on each other, will not clog the dovetailjoint. a loose taperin vertical ivot-pin upon In testimony whereof Ihave signed m which said mova 1e E's-{Jigs pivot, and a verjname to thisspecification in the presence of ticallyadju'stable loc -p1n adapted toen two subscribing Witnesses. 3o gage with the pivotpin to prevent thelatter HENRY M. BROOKFIELD.

from working u ward. Witnesses:

1-6. In a mo d-for forming insulators or I FRANK N. Ronnnron, similarglass articles, composed of movable DE FOREST JETMORE.

